ES2540256T3 - Fixing clamp - Google Patents

Abstract

Fixing clamp (10), more particularly, to be used in an external fixation system to hold fragments of bones adjacent to each other with the help of fixing elements, comprising at least two sets (20, 30) of clamp that they have at least one receiving element (71, 72, 73) to accommodate a fixing element along the longitudinal axis of the receiving element (71, 72, 73) and, at least, a blocking element (40) that is extends through the clamp assemblies (20, 30) to block the position of the clamp assemblies (20, 30) in a defined angular position, in which between said locking element (40) and at least said single clamp assembly (20) is arranged a washer (41), in which, as seen, observing along the locking element, a first clamp assembly (20) is followed, at least, by a second set (30) of clamp, in which the locking element (40) is in contact with the second do clamp assembly (30) by means of a thread (49), and in which the locking element (40) extends through the first clamp assembly (20), in which a spring (15) provides a axial force on the first caliper assembly (20), which is pushed against said washer (41), characterized in that said caliper assembly (20, 30) comprises a first contact surface (80) that is spherical and convex and because said washer (41) comprises a second contact surface (81) which is spherical and concave, in which the first contact surface (80) is in contact with the second contact surface (81), and because said washer comprises a cut (87) extending radially to the central axis (MI) of a through opening (84) through a side wall (85), such that said washer can be mounted and removed in a substantially radial direction towards the central axis (MI) of the blocking element (40).

Description

E10194943

06-23-2015

DESCRIPTION

Fixing clamp

5 TECHNICAL SECTOR

The present invention relates to a fixing clip and, more particularly, to a fixing clip to be used in an external fixation system to support bone fragments adjacent to each other.

10 PREVIOUS TECHNIQUE

External fixation systems are widely used to connect two or more bone fragments together. Such systems comprise bone screws, nipples and wires that are inserted directly into the bone material and these systems use external structural elements such as fixing rods, bars and

15 rings In order to connect the rods and bars to form a rigid frame, fixing clips are used. In addition, the fixing clamps are used to connect these screws and lugs to the rigid frame to specifically hold the bone fragments in the intended place.

From EP 0 700 664 an adjustable clamp is known comprising two pairs of jaws 20 which allow clamping of a rod as well as a pin.

From EP 1 627 609 a clamp for multiple rod-shaped elements is known, having a single pair of jaws. However, said clamp allows fixing with clamps of more than two, for example three or four rod-shaped elements, such as lugs, with a single clamp, thereby reducing the number

25 tweezers However, an additional fixing clamp is necessary to fix the rod of said clamp to the frame of the fixing system.

WO 2007/001945 mentions that the usual fixing clamps such as, for example, those known from EP 0 700 664 allow the fastening with single-screw or brass clamps to the frame and

30 that this way of attaching lugs or rods leads to large volume fixing systems. Accordingly, WO 2007/001945 discloses a clamp that addresses this problem and comprises two pairs of jaws, inside which each pair of jaws allows the introduction and fixation with tweezers of two rods or studs , etc., at the same time.

According to the prior art, these tweezers provide different diameters of the receiving elements provided by the jaws to introduce different measures of rods, lugs or wires, or are based on additional inserts such as, for example, those disclosed in EP 1 661 523. Said inserts reduce the diameter of the cavities of the receiving elements to allow a secure fixation of rods, lugs or wires of different sizes.

40 Another fixing clamp is known from EP 2 250 968. Users feel very comfortable with the clamp according to EP 2 250 968. However, there is a need for a clamp that can be cleaned more easily and can also compensate for the angular orientation between the rods. or the lugs during the assembly process.

45 CHARACTERISTICS OF THE INVENTION

It is an objective of the present invention to provide a fixing clip that solves the drawbacks of the prior art.

It is a particular objective of the present invention to disclose a fixing clip that can be disassembled for cleaning in a very easy way. This objective is achieved by a washer that can be disassembled in a direction substantially perpendicular to said locking element, according to claim 1.

In particular, it should also be avoided that the fixing clamp must be disassembled in a complicated manner and / or that all parts of the fixing clamps must be separated. This objective is achieved by a stop surface. The hole comprises, towards the contact surface, preferably a first diameter that is joined by a second diameter, in which the first diameter is larger than the second diameter, such that between the first and the second diameter a surface is arranged butt, whose butt surface serves

60 of stop element for the locking element, in particular for a flange, in case the washer is removed.

The fixing clip of the present invention is defined in claim 1.

Additional embodiments of the invention are set forth in the dependent claims. 65

fifteen

25

35

Four. Five

55

65

E10194943

06-23-2015

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments of the invention are described below with reference to the drawings, which are arranged for the purpose of showing the preferred embodiments of the invention, but not for the purpose of limiting it. In the drawings,

Figure 1 shows a perspective view of a first embodiment of a fixing clip of the present invention;

Figure 2 shows a section of the fixing clip of Figure 1;

Figure 3 shows a top view of the fixing clip of Figure 1;

Figure 4 shows a perspective view of a washer that is used in the clamp of Figure 1.

DESCRIPTION OF PREFERRED EMBODIMENTS

Figures 1 and 2 show a first preferred embodiment of a clamp element, or fixing clamp -10-, according to the invention. The element -10-of the clamp consists of a first set of clamp -20- and a second set of clamp -30-, and a locking element or rod -40-which is located in the holes -21-, -31 -in the interior of the two clamp assemblies -20-, -30-along the longitudinal axis -M-of the stem -40-. The rod -40- is preferably a locking element adapted to allow the closure of the clamp assemblies -20-and -30-. The stem -40-penetrates a first jaw -11-through a washer -41-.

The rod -40-comprises a head -44-part, a reduced -43 -43 part followed by a rod -42 part and a -49- threaded part. The threaded outer part -49-is adapted to be coupled in a complementary inner thread inside the distal jaw -11-, such that the rotation of the stem head -40-modifies the longitudinal position of the stem -40 -with respect to the lower jaw -11-, which allows the opening or closing of the entire clamp -10-overcoming the force of a spring -15-arranged between the two clamp assemblies -20-and -30 -. Said spring -15- is preferably located in the corresponding receiving elements -16- in the jaws -12-. Instead of a spring -15-arranged around the stem -40-, it is possible to arrange different elastic means such as Belleville washers or a compressible elastic solid body or a foam. By closing the clamp assemblies -20-and -30-, the jaws -12-adjacent to the spring -15-can, in the long run, come into contact and then the anti-rotation surface -55-which is arranged on both surfaces of the jaws -12-, fix the angular orientation of each set -20-, -30-of clamp, against each other.

Preferably, after having mounted the rod -40-with the thread -49-inside the lower jaw -11-, the end part of the thread -49-is destroyed by the pressure to ensure that the rod -40- cannot be removed from the -20-, -30-clamp assemblies to keep the clamp as one piece.

Each set -20-or -30-of clamp comprises two facing jaws -11-and -12-of the clamp. These jaws -11-and -12-have an essentially similar shape on the sides facing each other. Each of the jaws -11-, -12-comprises the respective contact surface -18-, -19-facing the other surface of the jaw -11-, -12-.

In order to prevent rotation between the jaw -11- and the jaw -12-, as well as in order to prevent the misalignment of the jaw -11-, -12- at least two orientation devices are arranged or anti-rotation devices -13-, -14-on surfaces -18-, -19-. In the present embodiment, in the second set -30-forceps, the jaw -11- comprises an opening -14- which extends on the surface -18- and the jaw -12- comprises a pin -13-protruding from the surface -19-. The pin -13- extends into the opening -14-. This brass-opening connection therefore prevents a possible rotation between the jaws -11-, -12- and a possible misalignment between said jaws -11-, -12-.

In this case, the jaws -11-and -12-are provided with three grooves -51-, -52-and -53-. The grooves -51-, -52-and -53-are all arranged in the same plane perpendicular to the longitudinal axis of the rod -40-. In said plane they are oriented perpendicularly to the radial direction from the center of the hole -21-or -31-. Thus, said grooves -51-, -52-and -53-are substantially parallel to the outer side wall -61-, -62-or -63 of each pair of jaws -11-and -12-.

Each pair of grooves -51-, -52-or -53-, respectively, in each jaw -11-and -12-defines a receiving element, that is, a first receiving element -71-, a second receiving element -72 -and a third receiving element -73-. The grooves -51-, -52-and -53-are each formed as a hemispherical rounded recess in section to provide the receiving elements -71-, -72-and -73-housing cylindrical lugs or rods of a defined diameter, if the clamp is closed. The outer side walls -61, -62 or -63-may comprise an inclined sliding surface to allow easier attachment of said lugs or rods -100 on the corresponding receiving element. The grooves -51-, -52, -53-are intended to form recesses

fifteen

25

35

Four. Five

55

65

E10194943

06-23-2015

hemispherical rounded in section. This means that the recesses provided by the grooves -51-, -52-, -53-have a hollow cylindrical shape to accommodate the rod-shaped elements. Some or all of the grooves -51-, -52-and -53-are also provided with elements that favor friction such as ribs -56-.

The three grooves -51-, -52-and -53-have different measures, so that the corresponding receiving elements -71-, -72-and -73-have three different measures. In other words, each receiving element -71-, -72-and -73-is adapted to accept a different fixing element, that is, a rod, a screw, a stud or a wire having a different diameter. A preferred embodiment of the first -20-clamp assembly has grooves that accept fasteners having a diameter of 12 mm, 8 mm and 5 mm, respectively. A different embodiment may have a sequence of diameters of 8 mm, 6 mm and 4 mm, respectively.

The second set -30-of the clamp, according to the embodiment of Figure 1, also comprises two parts -11-and -12 of the jaw and these parts comprise three grooves -51-, -52-, -53-. These grooves -51-, -52-, -53 also comprise a sequence of different sizes. In the embodiment shown, the inner part -12-of the jaws has an identical structure to that of the outer jaws -11-, especially in view of the anti-rotation device -55-, and the receiving element -16- for the spring -15-.

Within a preferred embodiment, the first clamp assembly -20-can comprise a sequence of small sizes, for example, 7 mm, 5 mm and 3 mm; or 6 mm, 5 mm and 4 mm; and the second set -30-of clamp can comprise a sequence of larger sizes, for example, 13.5 mm, 12 mm and 10 mm. Different sizes are possible, usually for wires from 2 mm in diameter to thicker rods with a diameter of 30 mm are used inside with said clamp -10-. A clamp -10-of this type allows the use of a single versatile clamp in which the first set -20-of clamp is used to fix a specific pin, or a screw, or a wire that has a diameter for which it is adapted one of the receiving elements -71-, -72-or -73-. The user takes the clamp -10- and orients the first set -20- of the clamp in the correct alignment, so that the pin or the screw can be held in the corresponding receiving element.

Then, the clamp -10-can be fixed a rod of an external fixing device with the help of the second set -30-of clamp. Said second set -30-of clamp can be oriented in such a way that the rod can be held in the corresponding receiving element. It is an advantage of the clamp -10-which has two sets -20-and -30-of clamp according to the invention, that a doctor who couples said clamp to a bone screw with a -20-clamp assembly and then a rod from an external fixing device to the other external clamp assembly -30-, you can check the strength of this external fixing device, and if you find that the rod you have used is not rigid enough, simply open the second set -30-of clamp, remove the thin rod, rotate the second set -30-clamp, for example 60 degrees in one direction or the other around the longitudinal axis to align the larger receiving element with the new thicker rod and replace it. This change does not require the replacement of said clamp -10-as was necessary with the prior art systems. The procedure for replacing said rod is faster and more reliable since the clamping of the bone screw has not changed, and avoids the use of a second sterile clamp at that time.

Of course, it is also possible that the second clamp assembly -30-is a traditional clamping set or even any other element known in the prior art with clamp elements. The objective of a versatile clamp assembly is already achieved by a first -20-clamp set, since it allows the fixation of one of three different sizes of screws, bolts or wires, by a simple reorientation of the first clamp set -20.

Figure 2 shows a section of the clamp according to Figure 1, in which the clamp -10-in a pre-assembly situation is shown, that is, the spring -15-is under tension. The upper jaw -11-of the first set -20-of clamp is therefore pushing the washer -41-against a flange -45-of the stem head -40-. The hole -21-which houses part of the portion -42-of the stem and the part -43-of reduced diameter, is provided with a diameter greater than the respective diameter of the rod -40-, so that angular movement is possible or pivoting the first set -20-of clamp against the rod -40-. This is especially advantageous during the mounting clamp assembly process. In this regard, it should be borne in mind that the hole -31- may also be provided with a larger diameter than that of the respective section of the rod -40-, such that said jaw -12- of the second clamp assembly can pivot with respect to the stem -40-.

The diameter -D1-, -D2-of the hole -21-of the first set -20-of clamp is larger than the diameter of the locking element -40-which extends through the hole -21-. In this way, a pivoting movement is possible

or of displacement between the blocking element -40- and the first set -20-of clamp during the positioning of the sets -20-, -30-of clamp and the lugs or rods. In the present embodiment, the hole -21-in the first jaw -11-is a hole -21- having a stop surface -86-. The abutment surface -86-is arranged by means of a stepped hole -21-having a first section with a first diameter -D1- and a second section with a second diameter -D2-. The first diameter -D1- is larger than the second diameter -D2-. The stop surface -86-serves as the stop element for the locking element -40-, in particular for the flange -45- in case the washer -41- is removed. Therefore, the stop surface -86-together with the flange -45

fifteen

25

35

Four. Five

55

65

E10194943

06-23-2015

prevents the first -20-caliper assembly from being separated from the second -30-caliper assembly when the washer is removed. Particularly, during a cleaning or sterilization process it is very advantageous to avoid such separation.

Alternatively, the hole -21-may be provided with a conical section -32-as shown with the hole -21-in the jaw -12-of the first clamp assembly. In the present embodiment, two conical sections are arranged, in which the diameter of the hole -21- decreases as the length of the hole increases as seen from the outside of the jaw -12-. If two conical sections -32- are present, the degree of pivoting movement can be increased.

The rod -40-as part of a locking element is threaded to the lower jaw -11-of the second set -30-of the clamp. Accordingly, the lower jaw 11 comprises a threaded opening. The thread can be arranged in the hole or the screw can be of the self-tapping type. Most commonly, a locking element may be arranged which may be a lever locking or bayonet locking element. Among these blocking elements there may also be support discs or toothed discs which, for simplicity, are not shown in the drawings.

Accordingly, the two sets -20-, -30-of clamp can be opened and closed by rotating the head of the rod -40- and thus rotating said rod -40- in the jaw thread.

In the sectional view of Figure 2, it can also be seen that the locking element -40-extends through the first set -20-of clamp and is in contact with the second set -30-of clamp by means of the threaded part -49-. In the mounting position in which the rods or lugs will be located in the receiving elements -71-, -72-, -73-, the first set -20-of clamp can be moved along the central axis -M- of the threaded part -49-. By actuating the locking element -40-, the first set -20-of the clamp will move overcoming the spring pressure towards the second set -30-of the clamp, such that the anti-rotation surface -55-of the first set - 20-clamp comes into contact with the respective anti-rotation surface -55-of the second set -30-clamp. Once the locking element -40-is firmly tightened, the first set -20-of clamp and the second set -30-of clamp are in contact with each other by means of the anti-rotation surface -55-.

In figure 2, the mounting position of the -20-, -30-clamp assemblies is shown. Thus, the clamp assemblies -20-, -30-are located at a certain distance from each other with respect to the central axis -M-. The second set -20-of clamp is in contact with the locking element -40-and the spring -15-pushes the first set of clamp away from the second set -20-of clamp towards the washer -41-that is in contact with the flange -45-of the blocking element.

As a summary: the -20-, -30-clamp assemblies will move due to the actuation of the locking element -40 from a mounting position to a blocking position and then, when the fixing must be released, from the blocking position to the mounting position. After use, the washer -41-will be removed, as explained below, to sterilize the clamp element -10-for another use.

Figure 3 shows a top view of the clamp according to Figures 1 and 2. Since the embodiment of Figure 1 comprises three grooves -51-, -52-and -53-, there are three side walls -61-, -62 -and -63-which provide, seen from above, as in Figure 2, a triangular shape of each set -20-or -30-of clamp.

In the present embodiment, the first set -20-of clamp, in this case the jaw -11-, comprises a first contact surface -80- that is in contact with a second contact surface -81-of the washer -41 -. The washer -41- and the first set -20-of clamp are in contact by means of said contact surfaces -80-, -81-. The contact surfaces -80-, -81-are spherical having the same radius of curvature, so that the washer -41-can slide with respect to the first set -20-of clamp on the contact surface -80 when it reaches the pivot movement mentioned above of the first set -20-of clamp with respect to the locking element -40-. The curvature is, at least, the same on an overlapping surface which, in this case, is defined as the surface that encompasses the maximum sliding movement of the washer -41- on the contact surface -80-.

In the present embodiment, the first contact surface -80- has a convex shape, while the second contact surface -81-has a concave shape. Said configuration is particularly advantageous since it allows a pivoting movement as mentioned above, while providing a very compact structure of the fixing clamp with respect to the axial and radial dimensions. In addition, the surfaces that are shaped as explained, allow the washer -41-, as explained in detail below, to be removed from the clamp element -10. In this way, the first set -20-of clamp and the second set -30-of clamp are loose, so that the pieces can move slightly along the central axis -My it is possible to sterilize the element -10 -de clamp without completely disassembling said element -10-clamp. This is very advantageous since during the sterilization the pieces remain together and it is not necessary to reassemble the pieces later. Consequently, the parts of the element -10

fifteen

25

35

Four. Five

55

65

E10194943

06-23-2015

The clamps remain loose together, so that the sterilization fluid can penetrate the free spaces between the respective parts. As mentioned above, providing the diameters -D1-and -D2-accordingly, the stop surface -86-serves as an element that holds the pieces together.

The first contact surface -80-of the first set -20-of clamp extends from a point -82-of the section between the central axis -M-of the locking element -40- and said first contact surface -80- towards the first set -20-of clamp.

Figure 3 shows the clamp element from above. In figure 3, the overlapping surface with the limiting edges -54- can be recognized.

Figure 4 shows the washer -41- in a perspective view, and in figure 2, a sectional view of the washer -41- is shown. Next, the structure of the washer -41- will be explained.

The washer -41- comprises, as mentioned above, the contact surface -81- and an upper surface -88- which is arranged at a certain distance from the contact surface -81-. A through central opening -84- has a central axis -M1- which is, at least partially, surrounded by a side wall -85-. Said through opening extends from the contact surface -81- to the upper surface -88-. The blocking element -40- extends through said through opening.

The side wall -85-is interrupted by the cut -87-that extends radially to the central axis -M1-through the side wall -85-to the opening -84-, so that the side wall -85-is interrupted. The cut -87-has a width that is slightly larger than the part -43-of reduced diameter of the locking element -40-, such that the washer -41-can be moved radially to the locking element -40 to remove said washer -41-after the use of the -10-clamp element. The width is defined as the free space of the cut -87-from the surfaces -89-of the side wall that limit the cut.

In addition, the washer -41- comprises a recess -83- which extends along the central axis -M1- from the upper surface -88- which is arranged in front of the contact surface -81-. The recess -83-is designed to accommodate the flange -45-of the locking element -40-. The recess -83- can also be designed as a stop element since it prevents the washer from moving radially towards the central axis -M- of the locking element -40-. To disassemble the washer -41-it is necessary to push the first set -10-of clamp towards the second set of clamp, so that the washer -41-can also move along the central axis -M-of the element lock -40-. In this way, the flange -45- will move out of the recess -83-. Once the flange -45-has been displaced so that there is no connection between the flange -45- and the recess -83-, the washer -41- can be moved radially towards the locking element -40-with which the rod of the blocking element will pass through the cut -87-of the washer.

Said recess -83- extends from the upper surface -88-, along the central axis -M1- of the through opening -84- to the washer -41-.

The washer is preferably made of a metallic material.

In summary, the arrangement of the contact surfaces -80, -81-has the advantage that during the assembly process of the fixing clamp -10-a pivoting movement of the first clamp assembly with a large deviation is possible. In addition, the washer -41-which can be removed has the advantage that the clamp assemblies -20-, -30 are movable along the interlocking element -40-, so that effective sterilization is possible.

LIST OF REFERENCE NUMBERS

10 fixing clamp

11 jaw

12 jaw

13 busty

14 hole

15 spring

16 receiving element

18 contact surface

E10194943

06-23-2015 E10194943

19

contact surface

twenty

first clamp set

5

twenty-one

orifice

30

second caliper set

31

orifice

32

conic section

40

stem, locking element

fifteen

41

washer

42

stem part

43

small diameter part

44

head part

Four. Five

flange

25

49

threaded part

51

first groove

52

second groove

53

third groove

54

limiting edges

35

55

anti-rotation surface

56

nerves

61

first side wall

62

second side wall

63

third side wall

Four. Five

71

first receiving element

72

second receiving element

73

third receiving element

80

contact surface

81

contact surface

55

82

section point

83

recess

84

through opening

85

side wall

86

stop surface

65

87

cut

06-23-2015

88

upper surface

89

surface

5

D1

diameter

D2

diameter

10

M1 central axis

M2

center shaft washer

Claims (8)

1. Fixing clip (10), more particularly, to be used in an external fixation system to hold 5 fragments of bones adjacent to each other with the help of fixing elements, comprising at least two clamp assemblies (20, 30) having at least one receiving element (71, 72, 73) to accommodate a fixing element along the longitudinal axis of the receiving element (71, 72, 73) and, at least one locking element (40) extending through the clamp assemblies (20, 30) to block the position of the assemblies 10 (20, 30) of caliper in a defined angular position, in which between said locking element (40) and, at least, said single caliper assembly (20) is arranged a washer (41), in which, as seen, observing along the blocking element, a first set (20) of clamp is followed, at least, by a second set (30) of clamp, in which the blocking element (40) is in contact with the second set (30) of clamp by means of a thread (49), and in which the locking element (40) extends through the first caliper assembly (20), in which a spring (15) provides an axial force on the first caliper assembly (20), which is pushed against said washer (41),  characterized because 20 said clamp assembly (20, 30) comprises a first contact surface (80) that is spherical and convex and because said washer (41) comprises a second contact surface (81) that is spherical and concave, wherein the first contact surface (80) is in contact with the second contact surface (81),  25 and why said washer comprises a cut (87) extending radially to the central axis (MI) of a through opening (84) through a side wall (85), such that said washer can be mounted and disassembled in a substantially radial direction towards the central axis (MI) of the blocking element (40). 30 2. Fixing clamp according to claim 1, wherein the first contact surface (80) of the clamp assembly (20, 30) extends from a point (82) of the section between the central axis (M) of the blocking element (40) and said first contact surface (80) towards the clamp assembly (20, 30). 3. Fixing clamp according to one of the preceding claims, wherein the radius of curvature of the contact surfaces (80, 81) is constant, at least with respect to the overlapping surface between the first contact surface (80) and the second contact surface (81) of the washer (41). 4. Fixing clip according to one of the preceding claims, wherein the concave surface (80) is complementary to the convex surface (81). 5. Fixing clip according to one of the preceding claims, wherein the washer (41) comprises a through central opening (84) having a central axis (M1) that is surrounded, at least partially, by means of a side wall (85) in which said locking element (40) extends through said opening (84). Four. Five 6. Clamp according to one of the preceding claims, wherein the locking element (40) comprises a flange (45) that is in contact with said washer (41) and in which the washer (41) preferably comprises a recess (83) that, at least partially, houses said flange (45). 7. Fixing clip according to claim 6, wherein said recess (83) extends along the central axis (M1) of the through opening (84) in the washer (41). 8. Fixing clamp according to one of the preceding claims, wherein the clamp assembly (20, 30) comprises a hole (21, 31) through which said locking element (40) extends, in which said hole (21, 31) 55 comprises a diameter (D1) that is larger than the diameter of the locking element (40) in the respective area in which the clamp assembly (20, 30) and / or parts of the clamp assembly (20, 30) can pivot against the locking element (40) and / or in which the hole (31) comprises at least one conical section (32), such that the clamp assembly (20, 30) can pivot against the blocking element (40). A fixing clip according to claim 8, wherein the hole (21) comprises, at least partially, a diameter (D2) that is smaller than the diameter of the flange (45) of the locking element (40) ). 10. Fixing clamp according to one of claims 8 or 9, wherein the hole (21) comprises, towards the surface of contact (80), a first diameter (D1) that is joined by a second diameter (D2), in which the first diameter (D1) is larger than the second diameter (D2), such that between the first and the second diameter (D1, 9 D2) a stop surface (86) is arranged, whose stop surface (86) serves as a stop element for the locking element (40), in particular for the flange (45), in case the washer (41 ) be withdrawn. 11. Fixing clip (10) according to any of the preceding claims, wherein each assembly (20, 30) of The clamp comprises two jaws (11, 12), in which each jaw (11, 12) comprises a certain number of grooves (51, 52, 53) to form said receiving elements (71, 72, 73) with the corresponding jaw (12, 11) and / or in which an elastic element (15) is provided between the clamp assembly (20, 30) that provides a force along the locking element (40). 12. Fixing clamp (10) according to any of the preceding claims, wherein the locking element (40) comprises a rod part (43) having a diameter that is smaller than said cut (87) in said washer (41). 10